Room Paging library always return null LiveData?

Question

I am trying to use a paging library in my project but when I try to recieve LiveData<PageList<Entity>> data it's value is always null. My implementation looks like this:

DAO

@Query("SELECT * FROM entity")
fun getAll(): DataSource.Factory<Int, Entity>

ViewModel

    val pagedListConfig = PagedList.Config.Builder()
            .setEnablePlaceholders(false)
            .setPageSize(20).build()

    val data = LivePagedListBuilder(database.getAll(), pagedListConfig)
                .build()
                .value

The data variable is always null.

Possible duplicate of : https://stackoverflow.com/questions/44428389/livedata-getvalue-returns-null-with-room — coroutineDispatcher, Apr 19 '19 at 15:23

score 2 · Accepted Answer · answered Apr 23 '19 at 11:15

2

Very simple, you're still working LiveData, so it should be just:

val data = LivePagedListBuilder(database.getAll(), pagedListConfig).build()

Then data is LiveData which you should observe.

answered Apr 23 '19 at 11:15

NoHarmDan

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Room Paging library always return null LiveData?

1 Answers1